Suhosin is an advanced protection system for PHP installations. It was designed to protect servers and users from known and unknown flaws in PHP applications and the PHP core. Suhosin comes in two independent parts, that can be used separately or in combination. The first part is a small patch against the PHP core, that implements a few low-level protections against bufferoverflows or format string vulnerabilities and the second part is a powerful PHP extension that implements all the other protections.
Feature List
Engine Protection (only with patch)
Misc Features
Feature List
Engine Protection (only with patch)
- Protects the internal memory manager against bufferoverflows with Canary and SafeUnlink Protection
- Protects Destructors of Zend Hashtables
- Protects Destructors of Zend Linked-Lists
- Protects the PHP core and extensions against format string vulnerabilities
- Protects against errors in certain libc realpath() implementations
Misc Features
- Protection Simulation mode
- Adds the functions sha256() and sha256_file() to the PHP core
- Adds support for CRYPT_BLOWFISH to crypt() on all platforms
- Transparent protection of open phpinfo() pages
- EXPERIMENTAL SQL database user protection
Runtime Protection
Session Protection
- Transparent Cookie Encryption
- Protects against different kinds of (Remote-)Include Vulnerabilities
- disallows Remote URL inclusion (optional: black-/whitelisting), disallows inclusiong of uploaded files, optionally stops directory traversal attacks
- Allows disabling the preg_replace() /e modifier
- Allows disabling eval()
- Protects against infinite recursion through a configureabel maximum execution depth
- Supports per Virtual Host / Directory configureable function black- and whitelists
- Supports a separated function black- and whitelist for evaluated code
- Protects against HTTP Response Splitting Vulnerabilities
- Protects against scripts manipulating the memory_limit
- Protects PHP‘s superglobals against extract() and import_request_vars()
- Adds protection against newline attacks to mail()
- Adds protection against \0 attack on preg_replace()
Session Protection
- Transparent encryption of session data
- Transparent session hijacking protection
- Protection against overlong session identifiers
- Protection against malicious chars in session identifiers
Filtering Features
GLOBALS, _COOKIE, _ENV, _FILES, _GET, _POST, _REQUEST
_SERVER, _SESSION, HTTP_COOKIE_VARS, HTTP_ENV_VARS
HTTP_GET_VARS, HTTP_POST_VARS, HTTP_POST_FILES
HTTP_RAW_POST_DATA, HTTP_SERVER_VARS, HTTP_SESSION_VARS
Supports a number of variables per request limit
Supports a maximum length of variable names [with and without indicies]
Supports a maximum length of array indicies
Supports a maximum length of variable values
Supports a maximum depth of arrays
just block violating variables
send HTTP response code
redirect the browser
execute another PHP script
Logging Features
- Filters ASCIIZ characters from user input
- Ignores GET, POST, COOKIE variables with the following names:
GLOBALS, _COOKIE, _ENV, _FILES, _GET, _POST, _REQUEST
_SERVER, _SESSION, HTTP_COOKIE_VARS, HTTP_ENV_VARS
HTTP_GET_VARS, HTTP_POST_VARS, HTTP_POST_FILES
HTTP_RAW_POST_DATA, HTTP_SERVER_VARS, HTTP_SESSION_VARS
- Allows enforcing limits on REQUEST variables or separated by type (GET, POST, COOKIE)
Supports a number of variables per request limit
Supports a maximum length of variable names [with and without indicies]
Supports a maximum length of array indicies
Supports a maximum length of variable values
Supports a maximum depth of arrays
- Allows only a configureable number of uploaded files
- Supports verification of uploaded files through an external script
- Supports automatic banning of uploaded ELF executables
- Supports automatic banning of uploaded binary files
- Supports automatic stripping of binary content in uploaded files
- Configureable action on violation
just block violating variables
send HTTP response code
redirect the browser
execute another PHP script
Logging Features
- Supports multiple log devices (syslog, SAPI module error log, external logging script)
- Supports freely configureable syslog facility and priority
- Supports log device separated selection of alert types to log
- Alerts contain filename and linenumber that triggered it
- Alerts contain the IP address of the user triggering it
- The IP Address can also be extracted from X-Forwarded-For HTTP headers (f.e. for reverse proxy setups)
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